package com.hmdp.utils;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {

    /**
     * 开始时间戳
     */
    private static final long BEGIN_TIMESTAMP = 1640995200L;

    private static int COUNT_BITS = 32;

//    @Autowired
//    private StringRedisTemplate redisTemplate;

    private StringRedisTemplate redisTemplate;

    public RedisIdWorker(StringRedisTemplate redisTemplate) {
        this.redisTemplate = redisTemplate;
    }

    public long nextId(String keyPrefix){
        //1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timeStamp = nowSecond - BEGIN_TIMESTAMP;
        //2.生成序列号
        //2.1获取当前日期，精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        //2.2自增长
        long count = redisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);
        //3.拼接返回
        return timeStamp << COUNT_BITS | count;
    }

//    public static void main(String[] args) {
//        LocalDateTime time = LocalDateTime.of(2022, 1, 1, 0, 0, 0, 0);
//        long second = time.toEpochSecond(ZoneOffset.UTC);
//        System.out.println("second="+second);
//
//    }
}
